On Tue, Jan 1, 2013 at 12:51 AM, Avishay Meron <
avishay.me...@mail.huji.ac.il> wrote:
> Hi Eric.
> Thank you very much for you quick response.
> I guess I need to dig up. I'm using defaults...
> Anyway, I assume the default configurations you refer to are not set to
> about 20 times lower than max possible.
>
The key is to figure out exactly how the h/w is being programmed.
If you send me a pointer to your tree I'd be happy to look.
> 20 is the factor of improvement I'm looking for (at least!).
> I hope I'm not chasing pavements here...
>
Not sure how one goes about chasing pavements :-)
>
> On Tue, Jan 1, 2013 at 5:32 AM, Eric Decker <cire...@gmail.com> wrote:
>
>>
>> How fast are you clocking the 1611 cpu?
>>
>> How fast are you clocking the SPI feeding the SD card?
>>
>> That will tell you the max theoretical rate you can transfer data.
>>
>> The high data rates to the SD assume the parallel 4 bit wide SD protocol
>> rather than the SPI single bit stream that is probably used on the Shimmer
>> or on my cards.
>>
>>
>> On Mon, Dec 31, 2012 at 2:55 PM, Avishay Meron <
>> avishay.me...@mail.huji.ac.il> wrote:
>>
>>> Hi all.
>>> Searching google and the mailing list, I haven't found an explicit
>>> answer to my problem. Here goes:
>>> I'm trying to test SD logging max write speed on a shimmer2r. I've tried
>>> using the FatFS but got unsatisfying results.
>>> So, I decided to write directly to the SD. Using a simple application
>>> (see code below), I found that the max rate of SD writing is about 20kB/s.
>>> Is that it? is this the maximum rate possible? I was hoping to get at least
>>> 0.5 or 1 MB/s. Any suggestions?
>>>
>>> Happy new year to you all...
>>>
>>> Here is my test code...
>>>
>>> -----------------TestSDP.nc-------------------
>>> #include "TestSD.h"
>>>
>>> module TestSDP{
>>> uses{
>>> interface Leds;
>>> interface Boot;
>>> interface SD;
>>> interface StdControl as SDStdControl;
>>> }
>>> }
>>>
>>> implementation{
>>>
>>> uint8_t resetData[SECTOR_SIZE], dummyData[SECTOR_SIZE];
>>> int8_t data=0xff;
>>> uint32_t beginSector=1000000, numOfIt=20000, currSector;
>>>
>>> //Using numOfIt=20000, it took the application 17 min and 47 sec to
>>> run,
>>> //from which 8 min and 51 sec to write dummyData.
>>> //The rest of the time the application Formated the sectors.
>>> //This means writing at about 20kB/s
>>>
>>> event void Boot.booted(){
>>> call Leds.led2Toggle();
>>> call SDStdControl.start();
>>> memset(resetData, 0, SECTOR_SIZE);
>>> memset(dummyData, data, SECTOR_SIZE);
>>> call Leds.led2Toggle();
>>> }
>>>
>>> void FormatSectors()
>>> {
>>> uint32_t i=0;
>>> currSector=beginSector;
>>> for (i=0; i<numOfIt; i++, currSector++)
>>> {
>>> call SD.writeBlock(currSector, resetData);
>>> }
>>> }
>>>
>>> void WriteDummyData()
>>> {
>>> uint32_t i=0;
>>> currSector=beginSector;
>>> for (i=0; i<numOfIt; i++, currSector++)
>>> {
>>> call SD.writeBlock(currSector, dummyData);
>>> }
>>> }
>>>
>>> async event void SD.available(){
>>> call Leds.led0Toggle();
>>> FormatSectors();
>>> call Leds.led0Toggle();
>>> call Leds.led1Toggle();
>>> WriteDummyData();
>>> call Leds.led1Toggle();
>>> call Leds.led2Toggle();
>>> }
>>>
>>> async event void SD.unavailable(){
>>> }
>>> }
>>>
>>> -----------------TestSDC.nc-------------------
>>>
>>> configuration TestSDC{
>>> }
>>> implementation{
>>> components MainC, LedsC, SDC, TestSDP as app;
>>> app.Boot -> MainC.Boot;
>>> app.Leds -> LedsC;
>>> app.SD -> SDC;
>>> app.SDStdControl -> SDC;
>>> }
>>>
>>> -----------------TestSD.h-------------------
>>> #ifndef TEST_SD_H
>>> #define TEST_SD_H
>>> #define SECTOR_SIZE 512
>>> #endif /* TEST_SD_H */
>>>
>>>
>>> Best
>>> Avishay
>>>
>>> _______________________________________________
>>> Tinyos-help mailing list
>>> Tinyos-help@millennium.berkeley.edu
>>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>>
>>
>>
>>
>> --
>> Eric B. Decker
>> Senior (over 50 :-) Researcher
>>
>>
>
>
> --
> Best
> Avishay
>
--
Eric B. Decker
Senior (over 50 :-) Researcher
_______________________________________________
Tinyos-help mailing list
Tinyos-help@millennium.berkeley.edu
https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
